public void TestPruneAllData()
{
// create genesis block
var genesisblock = CreateFakeBlock(1);
var genesisHeader = new ChainedHeader(genesisblock.Header, height: 0, totalWork: genesisblock.Header.CalculateWork().ToBigInteger(), dateSeen: DateTimeOffset.Now);
// create a block
var txCount = 100;
var block = CreateFakeBlock(txCount, genesisblock.Hash);
var chainedHeader = ChainedHeader.CreateFromPrev(genesisHeader, block.Header, dateSeen: DateTimeOffset.Now);
// create a long chain based off the block, to account for pruning buffer
var fakeHeaders = new FakeHeaders(new[] { genesisHeader, chainedHeader });
var chain = new ChainBuilder(Enumerable.Concat(new[] { genesisHeader, chainedHeader }, Enumerable.Range(0, 2000).Select(x => fakeHeaders.NextChained()))).ToImmutable();
// mock core daemon to return the chain
var coreDaemon = new Mock<ICoreDaemon>();
coreDaemon.Setup(x => x.CurrentChain).Returns(chain);
// create memory storage with the block
var storageManager = new MemoryStorageManager();
storageManager.BlockTxesStorage.TryAddBlockTransactions(block.Hash, block.BlockTxes);
// initialize the pruning worker
var workerConfig = new WorkerConfig(initialNotify: false, minIdleTime: TimeSpan.Zero, maxIdleTime: TimeSpan.MaxValue);
using (var pruningWorker = new PruningWorker(workerConfig, coreDaemon.Object, storageManager, null))
// get a chain state cursor
using (var handle = storageManager.OpenChainStateCursor())
{
var chainStateCursor = handle.Item;
// set the pruning worker to prune all data
pruningWorker.Mode = PruningMode.TxIndex | PruningMode.BlockSpentIndex | PruningMode.BlockTxesPreserveMerkle;
// wire event to wait for work
var workFinishedEvent = new AutoResetEvent(false);
pruningWorker.OnWorkFinished += () => workFinishedEvent.Set();
// wire event to track exceptions
Exception workException = null;
pruningWorker.OnWorkError += e => workException = e;
// start the worker
pruningWorker.Start();
// pick a random pruning order
var random = new Random();
var pruneOrderSource = Enumerable.Range(0, txCount).ToList();
var pruneOrder = new List<int>(txCount);
while (pruneOrderSource.Count > 0)
{
var randomIndex = random.Next(pruneOrderSource.Count);
pruneOrder.Add(pruneOrderSource[randomIndex]);
pruneOrderSource.RemoveAt(randomIndex);
}
// add an unspent tx for each transaction to storage
var unspentTxes = new UnspentTx[block.Transactions.Length];
chainStateCursor.BeginTransaction();
for (var txIndex = 0; txIndex < block.Transactions.Length; txIndex++)
{
var tx = block.Transactions[txIndex];
var unspentTx = new UnspentTx(tx.Hash, blockIndex: 1, txIndex: txIndex, txVersion: tx.Version, isCoinbase: txIndex == 0, outputStates: new OutputStates(1, OutputState.Spent));
unspentTxes[txIndex] = unspentTx;
chainStateCursor.TryAddUnspentTx(unspentTx);
}
chainStateCursor.CommitTransaction();
// create a memory pruning cursor to verify expected pruning results
var pruneCursor = new MemoryMerkleTreePruningCursor<BlockTxNode>(block.BlockTxes.Select(x => (BlockTxNode)x));
// prune each transaction in random order
var pruneHeight = 0;
foreach (var pruneTxIndex in pruneOrder)
{
// create a spent tx to prune the transaction
var pruneTx = block.Transactions[pruneTxIndex];
var spentTxes = BlockSpentTxes.CreateRange(new[] { unspentTxes[pruneTxIndex].ToSpentTx() });
// store the spent txes for the current pruning block
pruneHeight++;
chainStateCursor.BeginTransaction();
Assert.IsTrue(chainStateCursor.TryAddBlockSpentTxes(pruneHeight, spentTxes));
pruningWorker.PrunableHeight = pruneHeight;
// verify unspent tx is present before pruning
Assert.IsTrue(chainStateCursor.ContainsUnspentTx(pruneTx.Hash));
chainStateCursor.CommitTransaction();
// notify the pruning worker and wait
pruningWorker.NotifyWork();
workFinishedEvent.WaitOne();
// verify unspent tx is removed after pruning
chainStateCursor.BeginTransaction();
Assert.IsFalse(chainStateCursor.ContainsUnspentTx(pruneTx.Hash));
// verify unspent tx outputs are removed after pruning
for (var outputIndex = 0; outputIndex < pruneTx.Outputs.Length; outputIndex++)
Assert.IsFalse(chainStateCursor.ContainsUnspentTxOutput(new TxOutputKey(pruneTx.Hash, (uint)outputIndex)));
// verify the spent txes were removed
Assert.IsFalse(chainStateCursor.ContainsBlockSpentTxes(pruneHeight));
chainStateCursor.RollbackTransaction();
// prune to determine expected results
MerkleTree.PruneNode(pruneCursor, pruneTxIndex);
var expectedPrunedTxes = pruneCursor.ReadNodes().ToList();
// retrieve the actual transaction after pruning
IEnumerator<BlockTxNode> actualPrunedTxNodes;
Assert.IsTrue(storageManager.BlockTxesStorage.TryReadBlockTxNodes(block.Hash, out actualPrunedTxNodes));
// verify the actual pruned transactions match the expected results
CollectionAssert.AreEqual(expectedPrunedTxes, actualPrunedTxNodes.UsingAsEnumerable().ToList());
}
// verify all unspent txes were removed
chainStateCursor.BeginTransaction();
Assert.AreEqual(0, chainStateCursor.ReadUnspentTransactions().Count());
chainStateCursor.CommitTransaction();
// verify final block with all transactions pruned
IEnumerator<BlockTxNode> finalPrunedTxNodes;
Assert.IsTrue(storageManager.BlockTxesStorage.TryReadBlockTxNodes(block.Hash, out finalPrunedTxNodes));
var finalPrunedTxesList = finalPrunedTxNodes.UsingAsEnumerable().ToList();
Assert.AreEqual(1, finalPrunedTxesList.Count);
Assert.AreEqual(block.Header.MerkleRoot, finalPrunedTxesList.Single().Hash);
// verify no work exceptions occurred
Assert.IsNull(workException);
}
}
